When it hits
Day 61 on the Student's run
Warned on day 58 by 
Massive Zombie Horde - Warning, 3 days ahead.
Starts with Massive Zombie Horde, ends with 
Zombie Horde Subsides.
The same on every run: Wage Slave, Warehouse Manager
What comes
5 waves, 188 zombies in all.
From the game files11
Crisis 133
| id | 133 |
|---|---|
| CrisisID | 133 |
| StartEvent | [52653] |
| EndEvent | [52654,52866] |
| ForecastEvent | [52668] |
| Des | Crisis_Des_133 |
| Des_Local | 大尸潮 |
| CrisisShowType | 1 |
| CrisisShowPara | [8,9] |
| CrisisFmod | ["event:/Model/Zombie/zombie_zamen10","event:/Model/Zombie/zombie_zamen11","event:/Model/Zombie/zombie_zamen12","event:/Model/Zombie/zombie_zamen14","event:/Model/Zombie/weijizamen05"] |
| CrisisFmodTime | [11.9,8.1,12,10.2,11.2] |
| CrisisFmodGapMin | 1.5 |
| CrisisFmodGapMax | 4 |